pagect.java

来自「圣洁jsp留言板 以上程序在Win2k Server＋Mysql＋Resin＋J」· Java 代码 · 共 85 行

package lyb;
import java.sql.*;
import java.util.*;

public class PageCt
{
    private long l_start;   //开始纪录
    private long l_end;     //结束纪录
    private long l_curpage; //当前页数 
    private long l_totalnum;//总记录数
    private int int_num=10;  //每页10条
    private long l_totalpage; //总的页数

    public void Init(long currentpage,long totalnum)
    {
        l_curpage = currentpage;
        l_totalnum = totalnum;

        if (currentpage>=0)
        {
             if (currentpage>=(long)Math.ceil((double)l_totalnum/(double)int_num))
                l_curpage = (long)Math.floor((double)l_totalnum/(double)int_num);
             else
                l_curpage = currentpage;
        }
        else
        {
                l_curpage = 0;
        }

        l_start = l_curpage * int_num;
        l_end   = l_start + int_num;

        if (l_end > l_totalnum)
                l_end = l_totalnum;

        l_totalpage = (long)Math.ceil((double)l_totalnum/(double)int_num); 

    }

    public long getCurpage()
    {
        return l_curpage;
    }
    public long getPrepage()
    {
        if (l_curpage-1>=0)
        {
            return l_curpage-1;
        }
        else
        {
            return 0;
        }
    }
    public long getNextpage()
    {
        if (l_curpage+1<=l_totalpage)
        {
            return l_curpage+1;
        }
        else
        {
            return l_totalpage;
        }
    }
    public long getTotalnum()
    {
        return l_totalnum;
    }
    public long getTotalpage()
    {
        return l_totalpage;
    }
    public long getStart()
    {
        return l_start;
    }
    public long getEnd()
    {
        return l_end;
    }

}